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Schedule of Cash Flow Hedges Effect on Accumulated Other Comprehensive Earnings/(Losses), Net of Taxes (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated (loss)/gain at beginning of period $ (91) $ (36) $ (121) $ (45)
Transfer of realized (gains)/losses in fair value to earnings (13) (2) (10) 64
Unrealized gain/(loss) in fair value (6) 4 21 (53)
Accumulated (loss)/gain at end of period $ (110) $ (34) $ (110) $ (34)